Product introduction of insulation material hydrophobicity tester:
This instrument is mainly used to test the water-repellency test of thermal insulation products such as perlite, mineral wool, polystyrene foam, rigid polyurethane foam. Place the sample at a 450-degree angle with the center of the sample at a given position under the spray head. Spray the sample with a certain flow of water for a specified time. Calculate the test by measuring the change in sample mass before and after spray Volume percentage of the impervious part of the sample.
Second, the technical parameters of the insulation material hydrophobicity tester:
1) Hydrophobic tester
a. Water spraying device: It consists of metal nozzle, glass rotor flowmeter and regulated water source, with rubber tube connected in the middle. The middle of the metal nozzle is located on the longitudinal symmetry plane of the test surface and can be moved on the sample holder. The flow range of the glass rotor flowmeter is 10-100L / h, and the accuracy is 2.5 grade.
b. Sample holder: The sample holder is placed on a horizontally adjustable support at an inclination of 450.
c. Metal nozzle: the water spray surface is convexly rounded. Nineteen holes with a diameter of 0.9 mm are evenly distributed thereon. When the nozzle is tested at the position specified in FIG.
2) Balance: A small division value is not more than 0.5% of the weighed mass.
3) Drying box.
4) Thickness gauge: pressure plate pressure 98Pa, division value 0.1mm
5) Vernier caliper: The measuring range is 0-150mm, and the division value is 0.02mm.
6) Steel ruler: Measuring range is 0-300mm, division value is 1mm.
Third, the operating steps of the insulation material hydrophobicity analyzer:
★ Put the sample in a drying box and dry to constant weight at 105 ± 50C. When the sample is easily deformed or contains components that are volatile and changeable at this temperature, it can be dried to constant weight at 60 ± 50C or 5-100C less than the volatilization temperature. Weigh the sample m1.
★ Measure the size of the sample after drying. For plate-shaped products, the length and width are measured on the front and back sides of the sample, each of which is measured 4 times, and the reading is ** to 1 mm. The thickness of soft products is measured by a thickness gauge, and the thickness of hard products is measured by a vernier caliper. Three points are uniformly measured along the length of the sample, and the reading is ** to 0.1 mm. The inner and outer diameters of the tubular product shall be measured at both ends of the specimen, each at 4 locations. The length was measured twice. Reading ** to 1mm. The measurement results of each size of the sample are averaged. Calculate the thickness (or wall thickness) and volume of the sample.
★ Place the sample on a water-repellent side tester (for a sample that has been treated with water repellency on one side, the water repellency of both sides should be measured separately. For plate products, the nozzle position should be adjusted according to the thickness of the sample to Meet the requirements of Figure 1. For tubular products, the inner surface should be downward, adjust the position of the spray head, so that the upper part of the sample is evenly sprayed), adjust the water flow to stabilize it at 1L / min, and continuously spray for lh, then Remove the sample, use the crepe paper to quickly absorb the water droplets on the surface, and immediately weigh the sample mass m2.
Fourth, the insulation material hydrophobicity tester sample:
The size of the plate-shaped product sample is 300mm * 150mm, and the thickness is the original thickness of the product. The sample of the tubular product is 300mm long, the cross section is semi-circular or fan-shaped, and the wall thickness is the original wall thickness of the product. Samples should be prepared as representative as possible, and samples should not be taken from areas with wrinkles or surface damage. Skins should be removed from foam plastic products.
Fifth, the principle of the water-repellent measuring instrument of thermal insulation material:
Place the sample at a 450-degree angle with the center of the sample at a given position under the spray head. Spray the sample with a certain flow of water for a specified time. Calculate the test by measuring the change in sample mass before and after spray Volume percentage of the impervious part of the sample.